What is the meaning of under?

adjective

• Located below or beneath something else.
  • usage: "nether garments"; "the under parts of a machine"
  • synonyms: nether
• Lower in rank, power, or authority.
  • usage: "an under secretary"

adverb

• Down to defeat, death, or ruin.
  • usage: "their competitors went under"
• Through a range downward.
  • usage: "children six and under will be admitted free"
• Into unconsciousness.
  • usage: "this will put the patient under"
• In or into a state of subordination or subjugation.
  • usage: "we must keep our disappointment under"
• Below some quantity or limit.
  • usage: "fifty dollars or under"
• Below the horizon.
  • usage: "the sun went under"
• Down below.
  • usage: "get under quickly"
• Further down.
  • usage: "see under for further discussion"
  • synonyms: below